By Topic

First-principles study of field emission properties of CO adsorption on ZnO(101̅0)

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Wenjie Yu ; Sch. of Electron. Sci. & Eng., Southeast Univ., Nanjing, China ; Xiaobing Zhang ; Wei Lei ; Chen, Jing

Carbon monoxide (CO) is the main residual gas in T-ZnO field emission devices and is found to significantly decreasing the emission current. The electronic properties of the surface with CO molecule have been calculated by first-principles based on density functional theory. Carbon monoxide is weakly adsorbed on ZnO (101̅0) with adsorption energy of 1.67eV. The work function is further increased with adsorption from 4.606eV to 4.991 eV. The density of states (DOS) is minished from 118.6 to 94.34 compared to pure ZnO at Femi level. The electrons occupied at LUMO level of ZnO congregate to the CO molecule, resulting in the electrons harder to emit than the pure ZnO system. Fewer Mulliken charges were distributed near the surface, due to CO molecule repulsing the electron charges transferring from the bottom to the surface. The CO adsorption on ZnO (101̅0) surface lowers the probability of electrons emitting to the vacuum space and reduced electrons for emitting, which have a disadvantage for field emission.

Published in:

Vacuum Nanoelectronics Conference (IVNC), 2011 24th International

Date of Conference:

18-22 July 2011